I've looked into that (a little), seems like most suppliers direct from China are primarily interested in selling by the truckload. Wish I could afford to do that! I guess if I were going to go that route I'd probably just buy a container load of complete bikes and then part out 1/2 to 2/3 of them. I'd almost certainly make money on it, (especially if I got Shineray GY150 or 200's, since that is what local dealers seem to be selling but not supporting), but the initial capital investment is too high for me.
Found a guy on eBay who had some of the parts I needed, then went to "Bikenthings" for the rest of what I needed, though it sound sliek what I most need is on backorder. Anybody dealt with Bikenthings?
http://www.bikenthings.com/